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THD + Noise
In all cases THD is essentially unmeasurable, being less than the inherent noise of the amplifier until the output
level exceeds +20dBu.
Note: All THD+N measurements at gains above +30dB made using 40dB resistive pad to minimise effect of
generator noise at low signal levels.
Gain +18dB, input level +0dBu, output level +18dBu
20Hz to 10kHz THD + N < 0.0007% (20Hz - 22kHz filter)
20Hz to 20kHz THD + N < 0.002% (80kHz filter)
Gain +30dB, input level –12dBu, output level +18dBu
20Hz to 10kHz THD + N < 0.004% (20Hz - 22kHz filter)
20Hz to 20kHz THD + N < 0.005% (80kHz filter)
Gain +70dB, input level –50dBu, output level +20dBu
20Hz to 10kHz THD + N < 0.03% (20Hz - 22kHz filter)
20Hz to 20kHz THD + N < 0.05% (80kHz filter)
Crosstalk
Channel to channel crosstalk, measured with one input terminated with 150Ω. All channels at +50dB gain. A test
tone of –30dBu is applied to any channel input except the one under test. Crosstalk is the ratio of level at the
output of the test channel and the output of the channel to which signal is applied:
@ 50Hz < –105dB
@ 1kHz < –105dB
@ 15kHz < –90dB
Headroom
Headroom is defined at the output level at which THD exceeds 1%:
Headroom > +28dBu output level, 20Hz to 20kHz, any gain setting
Appendix
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